Struts2会进入Action,但不执行里面包括execute的任何方法!求帮助!

Struts2能进入Action,但不执行里面包括execute的任何方法!!求帮助!!
login.jsp页
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登陆系统</title>
</head>
<body>
    <%@include file="common/header.jsp"%>
    <table width="780" align="center" background="<%=ctx%>/images/bodybg.jpg">
        <tr>
            <td>
                <h6>请输入用户名和密码来登陆<br></h6>
                <s:if test="tip!=null">
                    <div class="error">
                        <s:property value="tip"/>
                    </div>
                </s:if>
                <s:actionerror cssClass="error"/>
                <s:form action="login.action" name="form1" method="execute">
                    <s:textfield name="username" label="用户名"/>
                    <s:password name="password" label="密码"/>
                    <tr>
                        <td colspan="2">
                            <s:submit value="登录" theme="simple"/>
                            <s:reset theme="simple" value="重置" />
                        </td>
                    </tr>
                </s:form>
            </td>
        </tr>
    </table>
    <%@include file="common/footer.jsp"%>
</body>
</html>

struts配置:
<struts>
    <constant name="struts.objectFactory" value="org.apache.struts2.spring.StrutsSpringObjectFactory"/>
    <!-- <constant name="struts.enable.DynamicMethodInvocation" value="false" /> -->
    <!-- 允许action的名字中出现"/" -->
    <constant name="struts.enable.SlashesInActionNames" value="true"/>
    <!-- 配置了系列常量 -->
    <constant name="struts.custom.i18n.resources" value="mess"/>
    <constant name="struts.i18n.encoding" value="UTF-8"/>
    
    <package name="default" extends="struts-default" abstract="true">
        <!-- 定义全局Result映射 -->
        <global-results>
            <result name="exception">/WEB-INF/jsp/error/error.jsp</result>
            <!-- 定义login逻辑视图对应的视图资源 -->
            <result name="login">/WEB-INF/jsp/login.jsp</result>

        </global-results>
        <global-exception-mappings>
            <!-- 定义全局异常映射 -->
            <exception-mapping result="exception" exception="java.lang.Exception" />
        </global-exception-mappings>